Don't have sex. There's your contraception.
Yea but good luck keeping young people from doing that. If contraception ceased to exist, you'd end up with even more single moms, kids in orphanages, even more rapid decline of the traditional family, and likely way more people on Gov't assistance.
I'd rather keep contraception and make the individual pay for it. Plus you have families who don't want more kids b/c they can't afford it but the husband and wife will still want sex to show love for one another. I don't see any legitimate argument against contraception.